Sintering and characterization of calcium alumino-titanate-SiC composite refractory fired in reducing and oxidizing atmospheres. Issue 15 (15th October 2019)

• Record Type: Journal Article
• Authors: Chen, Huizi; Chen, Jianwei; Zhao, Huizhong; Yu, Jun; Zhao, Pengda; Wang, Xianghui; Zhang, Han
• Is Part Of: Ceramics international. Volume 45:Issue 15(2019)
• Page Start: 18382
• Page End: 18388
• Publication Date: 2019-10-15
• Subjects: CAT-SiC -- Cold crush strength -- Atmosphere -- Mullite whisker -- Catalyst; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2019.06.053
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: Calcium alumino-titanate (CAT) is characterized by low thermal conductivity, low thermal expansion coefficient, and high refractoriness. The phase changes and microstructural evolution of a CAT-SiC composite refractory are investigated using X-ray diffraction, scanning electron microscopy, and thermodynamic analysis. Results show that the cold crush strengths of specimens fired in an oxidizing atmosphere are higher than those of specimens fired in a reducing atmosphere. In a reducing atmosphere, composites with SiO2 addition fired at 1350 °C exhibited the highest strengths. Good bonding occurred between different local reaction zones in specimens fired in an oxidizing atmosphere compared to those fired in a reducing atmosphere. Furthermore, a coexistent state of CA6 and corundum in CAT is observed in specimens fired in a reducing atmosphere, and mullite whisker growth occurred for composites without AlF3 ·3H2 O addition, where the TiO2 present in CAT acts as a catalyst.